JP2001193687A - Faulty fan detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To specify which fan is out of order, and keep on indicating that the fan is in obstacle even if a fan unit is disconnected from an electric power source. SOLUTION: In a fan unit 4 so constituted that plural fans are packaged in a tray capable of being drawn out of an electronic device, the output of a monitor signal S SV high in voltage corresponding to a competent failed fan when any fan is found to have been failed, thereby enables the competent fan to be easily specified. In order to secure safety by preventing an operator from being shocked by electricity, the indication of the failed fan is kept on even if the fan unit is disconnected fro an electric power source, maintenance performance can thereby be enhanced. Furthermore, even if failure detection is to be executed about plural fans, one signal line is considered good enough to transmit failure information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failed fan detecting apparatus, and more particularly, to a failed fan replacement or repair in an electronic device or the like in which forced air cooling is performed by a plurality of fans, when the failed fan is replaced or repaired. For detecting a failed fan.

[0002]

2. Description of the Related Art In an electronic device such as a network server, in order to maintain the performance or function of the device,
It is common to use a forced air cooling device that forcibly cools the device.

As this forced air cooling device, there is known a fan unit in which a plurality of fans are mounted on a tray which can be pulled out from the device. Then, in a fan unit in which a plurality of fans are mounted, it is necessary to specify a fan in order to replace only the failed fan when the fan has failed.

Here, a monitoring circuit disclosed in Japanese Patent Application Laid-Open No. Sho 64-82199 will be described.

Japanese Patent Laid-Open Publication No. Sho 64-82199 discloses a latch circuit for latching the output of an alarm circuit, and a display for displaying an image based on the output of the alarm circuit held by the latch circuit. It has been proposed that it is possible to determine which cooling fan has failed, thereby facilitating repair of the failed cooling fan.

More specifically, as shown in FIG. 5, in a monitoring circuit 200 for monitoring a plurality of cooling fans 201, 205, 208, 211, the cooling fans 201, 2
05, 208, 211 and cooling fans 201, 20
Rotation discriminator 2 for discriminating the rotation state of 5, 208, 211
02, 206, 209, and 212, a rotation discriminator 202,
Alarm circuits 203, 207, 210, which output alarm information when the rotation speed of the corresponding cooling fan among the cooling fans 201, 205, 208, 211 decreases based on the determination results of 206, 209, 212, 21
3 and a latch circuit 21 for latching alarm information output from the alarm circuits 203, 207, 210 and 213.
4, 216, 218, 220 and the latch circuits 214, 2
Indicators 215, 217, 21 for displaying an alarm based on the alarm information held in the registers 16, 218, 220
9, 221 and alarm circuits 203, 207, 210,
213 includes an OR circuit 222 that outputs the alarm information to the outside when the alarm information is output from at least one of the alarm circuits.

The rotation discriminators 202, 206, 209, 21
2 determines the rotation state of the cooling fans 201, 205, 208, 211, and outputs the determination result to the alarm circuits 203, 2.
07, 210, and 213.

The alarm circuits 203, 207, 210, 2
13 is a cooling fan 201, 205, 20 based on the determination result of the rotation determiners 202, 206, 209, 212.
The latch circuit 21 corresponding to the alarm information when the number of rotations of the corresponding cooling fan among the motors 8 and 211 decreases.
4, 216, 218, 220 and the OR circuit 222.

Thus, the latch circuits 214, 216,
218, 220 are alarm circuits 203, 207, 21
0 and 213 are latched, and the indicators 215, 217, 219 and 221 are latched by the latch circuit 2
An alarm is displayed based on the alarm information held in 14, 216, 218 and 220.

The OR circuit 222 is connected to the alarm circuit 2
When the alarm information is output from at least one of the alarm circuits 03, 207, 210, and 213, the alarm information is output to the outside.

As a result, any of the cooling fans 201, 2
05, 208, and 211 are displayed on the display 2
15, 217, 219, 221 and repair of a failed cooling fan was facilitated.

[0012]

However, in the conventional monitoring circuit 200, a plurality of cooling fans are mounted on a drawer-like tray to constitute a fan unit.
Considering that the tray is pulled out to replace one of the cooling fans 201, 205, 208, and 211 that is in a failed state, the alarm circuits 203, 20
7, 210, 213 and indicators 215, 217, 21
When connectors 9 and 221 are connected by a connector, there is a problem that the number of signal lines is required for the number of cooling fans.

Also, by removing the fan unit,
Since the alarm information is cleared, it is unknown which cooling fan is in a failure state, and there has been a problem that the working efficiency at the time of replacing the fan is reduced.

In view of the above, the present invention has been made in view of the above-mentioned conventional technology, and specifies which one of a plurality of fans is in a failure state and, when the fan unit is pulled out. In order to prevent danger, an object of the present invention is to provide a failed fan detection device that can continue to display a failed fan even when the power supply of the fan unit is disconnected from the main device.

[0015]

According to one aspect of the present invention, there is provided a failed fan detecting device for detecting which one of a plurality of fan devices has failed. A failure detection unit that outputs a failure detection signal having a voltage corresponding to the fan device, and a notification unit that notifies a failed fan device among the plurality of fan devices based on the failure detection signal. It is characterized by:

According to the first aspect of the invention, the failure detection means outputs a failure detection signal having a voltage corresponding to the fan device in a failure state to the notification means. Also,
The notifying unit notifies the failed fan device of the plurality of fan devices based on the input failure detection signal.

According to a second aspect of the present invention, in the first aspect of the present invention, the failure detecting means monitors a failure state of the plurality of fan devices and outputs a monitoring signal having a voltage corresponding to the failure state. And a failure signal generating means for generating the failure detection signal based on the monitoring signal.

According to the second aspect of the invention, in addition to the operation of the first aspect, the failure state monitoring means of the failure detection means monitors the failure states of the plurality of fan devices and responds to the failure state. The monitoring signal having the output voltage is output to the failure signal generating means. The failure signal generating means generates a failure detection signal based on the monitoring signal.

According to a third aspect of the present invention, in the second aspect of the present invention, the failure state monitoring means divides a voltage of a predetermined monitoring reference signal to generate the failure detection signal. It is characterized by having.

According to the third aspect of the present invention, in addition to the operation of the second aspect, the voltage dividing means of the fault condition monitoring means divides the voltage of the predetermined monitoring reference signal by dividing the voltage. Generate a failure detection signal.

According to a fourth aspect of the present invention, in the third aspect of the invention, the failure state monitoring means is provided on the fan device side, and the monitoring signal is transmitted to the failure signal via one signal transmission line. It is characterized by being transmitted to the generating means.

According to the fourth aspect of the present invention, in addition to the operation of the third aspect, the failure state monitoring means transmits the monitoring signal from the fan device to the failure signal generation means via one signal transmission line. To be transmitted.

According to a fifth aspect of the present invention, in the second aspect of the present invention, the failure detecting means detects that any one of the fan devices is in the failure state based on the failure detection signal. A signal holding means for holding the output of the failure detection signal until the monitoring signal corresponding to a case where all the fan devices are in a normal operation state is provided.

According to the fifth aspect of the present invention, in addition to the function of the second aspect of the present invention, the signal holding means of the failure detecting means is configured to switch any one of the fan devices to the failure state based on a failure detection signal. After that, the output of the failure detection signal is held until a monitoring signal corresponding to a case where all the fan devices are in the normal operation state is output.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the signal holding means is reset when the monitor signal corresponding to a case where all the fan devices are in a normal operation state is output. Reset means for resetting.

According to the sixth aspect of the present invention, in addition to the operation of the fifth aspect of the present invention, the reset means outputs the monitor signal corresponding to a case where all the fan devices are in a normal operation state. Resets the signal holding means.

According to a seventh aspect of the present invention, in the fifth or sixth aspect, the signal holding means includes a self-holding relay device.

According to the seventh aspect of the present invention, in addition to the function of the fifth or sixth aspect of the present invention, the self-holding relay device of the signal holding means is capable of bringing all the fan devices into a normal operating state. The output of the failure detection signal is held until a monitoring signal corresponding to a certain case is output.

[0029]

Next, a specific example of an embodiment of a failed fan detecting device according to the present invention will be described with reference to the drawings.

FIG. 1 shows an electronic apparatus provided with a failed fan detecting apparatus according to the present invention. This electronic apparatus 100 is an electronic apparatus main unit on which various circuit boards 1-1, 1-2,... Are mounted. 2 and a fan unit 4 having a plurality of fans 3-1, 3-2,... For forcibly cooling the electronic device main unit 2.

In this case, the fan unit 4
.. Are formed so as to be easily pulled out toward the front of the drawing when the fans 3-1, 3-2,.

FIG. 2 is a schematic block diagram of a main part of the electronic device 100 shown in FIG. FIG. 2 illustrates a case where the fan unit 4 includes four fans for simplification of the description.

As shown in FIG. 2, the electronic device 100 roughly includes fans 3-1 to 3-4 and outputs a monitoring signal SSV corresponding to a failure state of the fans 3-1 to 3-4. Fan unit 4 and the fan 3 based on the monitoring signal SSV.
A failure detection circuit 10 for detecting which of the fans -1 to 3-4 is in a failure state and outputting a display control signal for controlling a display circuit 11, which will be described later, and an output from the failure detection circuit 10. A display circuit 11 for notifying a user of a failure state based on the display control signal, and a reset circuit for resetting a display on the display circuit 11 to an initial state when the fan unit 4 returns from the failure state to a normal operation state. 12 is provided.

The fan unit 4 is, as shown in FIG.
Broadly speaking, the monitoring signals SSV based on the fans 3-1 to 3-4 and the fan failure signals SD1 to SD4 output when any one of the fans 3-1 to 3-4 is in a failure state. And a monitor signal voltage control unit 15 for controlling the voltage of the monitor signal.

The monitoring signal voltage controller 15 monitors the voltage dividing resistors R1 to R5 for dividing the monitoring signal reference voltage VSVREF (for example, -50 [V]), and monitors when the fan 3-1 is in a failure state. The signal reference voltage VSVREF is connected to the resistor R1 and the resistor group R.
A relay RL1 for switching the circuit connection state in the monitor signal voltage control unit 15 to divide the voltage between the relay RL1 and the fan 3;
A relay RL2 for switching a circuit connection state in the monitor signal voltage control unit 15 so as to divide the monitor signal reference voltage VSVREF into the resistor groups R1 and R2 and the resistor groups R3 to R5 when -2 is in a failure state; When 3-3 is in a failure state, the monitor signal voltage controller 15 divides the monitor signal reference voltage VSVREF by the resistor groups R1 to R3 and the resistor groups R4 and R5.
The relay signal RL3 for switching the circuit connection state in the circuit and the monitoring signal reference voltage VSVREF when the fan 3-4 is in a failure state.
And a relay RL4 for switching a circuit connection state in the monitor signal voltage control unit 15 so as to divide the voltage by the resistor groups R1 to R4 and the resistor R5.

The reset circuit 12, as shown in FIG.
The monitoring signal SSV is input to one input terminal, the predetermined reference voltage Vref1 is input to the other input terminal, and the voltages of the two input signals are compared to determine the voltage of the monitoring signal SSV of the fan unit 4 (FIG. 1). Voltage reset control signal S corresponding to the state
When the fan unit 4 returns from the failure state to the normal operation state based on the comparator 21 that outputs CRST and the voltage reset control signal SCRST, the reset voltage Vrese
and a switch unit 22 for applying t to the failure detection circuit 10 (FIG. 2). In the following description, the reference voltage Vref1 is set based on the monitor signal reference voltage VSVREF. For example, the monitor signal reference voltage VSVREF = −
In the case of 50 [V], it is set to -45 [V].

As shown in FIG. 4, the failure detection circuit 10
It has voltage dividing resistors R11 to R15 and has detection reference voltages VR1 to VR
The detection reference voltage generation circuit 25 that generates R4, the monitoring signal SSV is input to one input terminal, the detection reference voltage VR1 is applied to the other input terminal, and the fans 3-1 to 3-4 are in a failure state. The first set signal SSET1 which becomes "H" level in the case
And the monitoring signal SSV is input to one input terminal, the detection reference voltage VR2 is applied to the other input terminal, and the fans 3-2 to 3-4 are in a failure state. A second comparator OP2 for outputting a second set signal SSET2 at H level, a monitoring signal SSV input to one input terminal, a detection reference voltage VR3 applied to the other input terminal, and fans 3-3 to 3-3 -4 is in a failure state, a third comparator OP3 which outputs a third set signal SSET3 which becomes "H" level, a monitor signal SSV is input to one input terminal, and a detection reference voltage VR4 is input to the other input terminal.
"H" when the fan 3-4 is in a failure state.
And a fourth comparator OP4 for outputting a fourth set signal SSET4 at a level.

The display circuit 11 has a notification light emitting diode LED1 to LED4 for notifying a failure state, a reset signal input to a reset terminal R, a first set signal SSET1 input to a set terminal S, and a first set signal SSET1. Signal SSET1
Becomes "H" level, that is, when it is detected that the fan 3-1 is in a failure state, the light emitting diode LE
Polarized self-holding relay RL11 that turns on D1
When the reset signal is input to the reset terminal R, the second set signal SSET2 is input to the set terminal S, and the second set signal SSET2 becomes “H” level, that is, the fan 3-2 is in a failure state. A polarized self-holding relay RL12 that turns on the light emitting diode LED2 when it is detected as being present, a reset signal is input to a reset terminal R, a third set signal SSET3 is input to a set terminal S,
A polarized self-holding relay RL13 that turns on the light emitting diode LED3 when the third set signal SSET3 becomes "H" level, that is, when it is detected that the fan 3-3 is in a failure state, and a reset. When the reset signal is input to the terminal R, the fourth set signal SSET4 is input to the set terminal S, and the fourth set signal SSET4 becomes “H” level, that is, it is detected that the fan 3-4 is in a failure state. And a polarized self-holding relay RL14 that turns on the light emitting diode LED4 when the operation is performed.

The light emitting diodes LED1 to LED4
The resistors R21 to R24 inserted between the anode terminal and the ground side power supply GND are current limiting resistors.

In this case, the polarized self-holding relays RL11 to RL14 are turned on when the corresponding fan is in a failure state, and correspond to the first contact A for turning on the corresponding light emitting diode. A second contact B that is turned on when the switch is in a normal operation state.

Next, the operation of the faulty fan detecting device having the above configuration will be described.

First, the operation when all the fans 3-1 to 3-4 are in a normal operation state will be described.

At this time, the relays RL1 to RL4 of the monitor signal voltage control section 15 are on the contact N side corresponding to the normal operation state, and the resistors R1 to R5 are connected to the monitor signal reference voltage VSV.
Since it does not contribute to the voltage division of REF, the voltage of the monitoring signal SSV is applied to the failure detection circuit 10 and the reset circuit 12 while keeping the voltage of -50 [V].

At this time, the detection reference voltage generation circuit 25 of the failure detection circuit 10 uses the voltage dividing resistors R11 to R15 to detect the detection reference voltage VR1 = −45 [V] and the detection reference voltage VR2 = −35.
[V], the detection reference voltage VR3 = -25 [V], and the detection reference voltage VR4 = -15 [V].

Thus, the comparators OP1 to OP4
Since the absolute value of the voltage of the monitor signal SSV is larger than the absolute values of the corresponding detection reference voltages VR1 to VR4, the set signal S
SET1 to SSET4 are all at "L" level.

Therefore, the polarized self-holding relays RL11-RL11
The first contacts A of the RL 14 are all off, the second contacts B are all on, and all the light emitting diodes LED1 to LED
4 is in a non-lighting state, and it can be seen that all the fans 3-1 to 3-4 are in a normal operation state.

Next, the operation when the fan 3-1 is in a failure state will be described.

At this time, the relay RL1 of the monitor signal voltage control unit 15 is on the contact UN side corresponding to the case where the fan 3-1 is in a failure state, and the monitor signal reference voltage VSVREF
Is divided by the resistor R1 and the resistor groups R2 to R5, and the voltage of the monitoring signal SSV is a voltage between the detection reference voltage VR1 = −45 [V] and the detection reference voltage VR2 = −35 [V] (for example, − 40
[V]).

Accordingly, the comparator OP1 sets the set signal SSET1 to the "H" level because the absolute value of the corresponding detection reference voltage VR1 is larger than the absolute value of the voltage of the monitor signal SSV.

On the other hand, the comparators OP2 to OP4 output the set signals SSET2 to OP4 because the absolute value of the monitor signal SSV is larger than the absolute values of the corresponding detection reference voltages VR2 to VR4.
All SSET4 are at "L" level.

Therefore, the polarized self-holding relay RL12
All the first contacts A of the RL14 are turned off, and all the second contacts B are turned on.
The contact A is turned on, and the second contact B is turned off. As a result, only the light emitting diode LED1 is turned on,
This indicates that the fan 3-1 is in a failure state.

In this case, even if the fan unit 4 is pulled out to replace the fan 3-1 and the power to the fan unit 4 is cut off to prevent danger, the polarized self-holding relays RL1 to RL4 First contact A and second contact A
Since the state of the contact B is maintained, the failure state of the fan 3-1 can be continuously notified.

Next, the operation when the fan 3-2 is in a failure state will be described.

At this time, the relay RL2 of the monitor signal voltage control unit 15 is on the contact UN side corresponding to the case where the fan 3-2 is in a failure state, and the monitor signal reference voltage VSVREF
Is divided by the resistor groups R1 and R2 and the resistor groups R3 to R5,
The voltage of the monitoring signal SSV is the detection reference voltage VR2 = -35 [V]
And a detection reference voltage VR3 = -25 [V] (for example, -30 [V]).

As a result, the comparators OP1 and OP2
Since the absolute values of the corresponding detection reference voltages VR1 and VR2 are larger than the absolute value of the voltage of the monitor signal SSV, the set signals SSET1 and SSET2 go to the “H” level.

On the other hand, since the absolute value of the monitor signal SSV is larger than the corresponding detection reference voltages VR2 to VR4, the comparators OP3 and OP4 output the set signals SSET3 and OP4.
SSET4 becomes "L" level.

Therefore, the polarized self-holding relay RL13,
All of the first contacts A of the RL 14 are turned off and all of the second contacts B are turned on, so that the polarized self-holding relays RL1, RL
2, the first contact A is turned on, and the second contact B is turned off. As a result, since the power of the light emitting diode LED1 is cut off by the second contact B of the polarized self-holding relay RL12, only the light emitting diode LED2 is turned on, and it can be understood that the fan 3-2 is in a failure state. Becomes

In this case as well, even if the fan unit 4 is pulled out to replace the fan 3-2 and the power supply to the fan unit 4 is cut off to prevent danger, the polarized self-holding relays RL1 to RL1 are not used. Since the states of the first contact point A and the second contact point B of the RL 4 are maintained, the failure state of the fan 3-2 can be continuously notified.

Next, the operation when the fan 3-3 is in a failure state will be described.

At this time, the relay RL3 of the monitor signal voltage control unit 15 is on the contact UN side corresponding to the case where the fan 3-3 is in a failure state, and the monitor signal reference voltage VSVREF
Is divided by the resistance groups R1 to R3 and the resistance groups R4 and R5,
The voltage of the monitoring signal SSV is the detection reference voltage VR3 = -25 [V]
And a detection reference voltage VR4 = −15 [V] (for example, −20 [V]).

Thus, the comparators OP1 to OP3
Since the absolute values of the corresponding detection reference voltages VR1 to VR3 are larger than the absolute value of the voltage of the monitor signal SSV, the set signals SSET1 to SSET3 go to the “H” level.

On the other hand, in the comparator OP4, since the absolute value of the voltage of the monitor signal SSV is larger than the absolute value of the corresponding detection reference voltage VR4, the set signal SSET4 goes to "L" level.

Accordingly, the first contact A of the polarized self-holding relay RL14 is turned off, the second contact B is turned on,
The first contacts A of the polarized self-holding relays RL1 to RL3 are all on, and the second contacts B are all off. As a result, since the power of the light emitting diodes LED1 and LED2 is cut off by the second contact B of the polarized self-holding relay RL13, only the light emitting diode LED3 is turned on and the fan 3-3 is in a failure state. You will understand.

Also in this case, when the power supply of the fan unit 4 is cut off to prevent danger, the states of the first contact A and the second contact B of the polarized self-holding relays RL1 to RL4 are maintained. Therefore, it is possible to continuously notify the failure state of the fan 3-3.

Next, the operation when the fan 3-4 is in a failure state will be described.

At this time, the relay RL4 of the monitor signal voltage control unit 15 is on the contact UN side corresponding to the case where the fan 3-4 is in a failure state, and the monitor signal reference voltage VSVREF
Is divided by the resistor groups R1 to R4 and the resistor R5, and the voltage of the monitor signal SSV becomes a voltage (for example, -10 [V]) higher than the detection reference voltage VR4 = -15 [V].

Thus, the comparators OP1 to OP4
Since the absolute values of the corresponding detection reference voltages VR1 to VR4 are larger than the absolute value of the voltage of the monitor signal SSV, the set signals SSET1 to SSET4 go to the “H” level.

Therefore, the polarized self-holding relays RL1 to RL
The first contacts A of L4 are all on, and the second contacts B are all off. As a result, the light emitting diodes LED1, L
ED2 is the second contact B of the polarized self-holding relay RL13.
The power is cut off by the light emitting diode LED3.
Only the light is turned on, which indicates that the fan 3-3 is in a failure state.

Also in this case, when the power of the fan unit 4 is cut off to prevent danger, the states of the first contact A and the second contact B of the polarized self-holding relays RL1 to RL4 are maintained. Therefore, it is possible to continuously notify the failure state of the fan 3-3.

The operation when one of the fans 3-1 to 3-4 fails and the replacement of the failed fan is completed will be described.

By replacing the fans, all the fans 3-1 to 3-1
-4 is in a normal operation state, so that the monitoring signal voltage control unit 15
Relays RL1 to RL4 are on the contact N side corresponding to the normal operation state. As a result, since the resistors R1 to R5 do not contribute to the division of the monitor signal reference voltage VSVREF, the monitor signal SS
The voltage of V is applied to the reset circuit 12 while keeping -50 [V].

In FIG. 3, the comparator 21 of the reset circuit 12 compares the monitor signal SSV with the reference voltage Vref1, and determines that the fan unit 4 has returned from the failure state to the normal operation state, and turns on the switch unit 22. .

As a result, the switch section 22 applies the reset voltage Vreset to the reset terminals R of the polarized self-holding relays RL1 to RL4 of the failure detection circuit 10.

Accordingly, the polarized self-holding relays RL1 to RL
All the first contacts A of L4 are in the off state, all the second contacts B are in the on state, all the light emitting diodes LED1 to LED4 are in the non-lighting state, and all the fans 3-1 to 3-4 have shifted to the normal operation state. It will be understood that.

As described above, according to the present embodiment, the tray which can be pulled out from the electronic device is placed on the tray.
Fan unit 4 having a configuration for mounting a plurality of fans
In the above, when one of the fans fails, the failed fan can be easily specified.

When the fan unit 4 is pulled out, the power supply of the fan unit is disconnected from the main unit in order to prevent the danger of electric shock and to ensure the safety, but the display of the failed fan may be continued. It becomes possible, and maintainability is improved.

Further, even in the case of detecting a failure of a plurality of fans, the voltage generated by the voltage dividing resistors R1 to R5 is transmitted as failure information, as in the case of connection with a conventional connector. The number of signal lines is not required for the number of fans, and the device configuration can be simplified.

[0078]

As described above, according to the configuration of the first aspect, the failure detection means outputs a failure detection signal having a voltage corresponding to the fan device in a failure state to the notification means, and the notification means. Informs a failed fan device among a plurality of fan devices based on the input failure detection signal, so that it is possible to easily identify a fan in a failure state based on the voltage of the failure detection signal. Become.

According to the configuration of claim 2, in addition to the effect of the configuration of claim 1, the failure state monitoring means of the failure detection means monitors the failure states of the plurality of fan devices and responds to the failure state. Since the monitoring signal having the detected voltage is output to the failure signal generation means, and the failure signal generation means generates the failure detection signal based on the monitoring signal, the failure detection signal can be easily generated.

According to the configuration of claim 3, in addition to the effect of the configuration of claim 2, the voltage dividing means of the failure state monitoring means divides the voltage of the predetermined monitoring reference signal by dividing the voltage. Since the failure detection signal is generated, the failure detection signal can be generated with a simple configuration.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect, the failure state monitoring means transmits the monitoring signal from the fan device via the one signal transmission line to the failure signal generating means. The number of signal lines is not necessary for the number of fans as in the case of connecting with a connector.
The device configuration is simplified and the maintainability is improved.

According to the structure of claim 5, in addition to the effect of the structure of claim 2, the signal holding means of the failure detecting means is in a state where one of the fan devices is in a failure state based on the failure detection signal. After that, the output of the failure detection signal is held until the monitoring signal corresponding to the case where all the fan devices are in the normal operation state is output. Even when the power supply to the device is stopped, it is possible to easily specify the fan device in a faulty state, perform replacement work, and the like, thereby improving maintainability.

According to the configuration of the sixth aspect, in addition to the effect of the configuration of the fifth aspect, the reset means outputs a monitoring signal corresponding to a case where all the fan devices are in a normal operation state. Then, reset the signal holding means,
The transition to the normal operation state can be reliably notified while the user's labor is reduced.

According to the configuration of claim 7, in addition to the effect of the configuration of claim 5 or claim 6, in the self-holding relay device of the signal holding means, all the fan devices are in a normal operation state. Since the output of the failure detection signal is maintained until the monitoring signal corresponding to the case is output, even if the power supply to each fan device is stopped to ensure safety when replacing the fan, the failure easily occurs. The fan device in the state can be specified, replacement work or the like can be performed, and the maintainability is improved.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an electronic apparatus to which a failed fan detection device according to the present invention is applied.

FIG. 2 is a schematic block diagram of the electronic device of FIG. 1;

FIG. 3 is a schematic configuration block diagram of a reset circuit of the failed fan detection device according to the present invention.

FIG. 4 is a schematic configuration block diagram of a detection circuit and a display circuit of the failed fan detection device according to the present invention.

FIG. 5 is a configuration explanatory diagram showing an example of a conventional monitoring circuit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 electronic device 1-1, 1-2 circuit board 2 electronic device main unit 3-1, 3-2, 3-3, 3-4 fan 4 fan unit 10 failure detection circuit 11 display circuit 12 reset circuit 15 monitor signal voltage Control unit 22 Switch unit 25 Detection reference voltage generation circuit LED1 to LED4 Light emitting diode OP1 to OP4 Comparator RL1 to RL4 Polarized self-holding relay SSV Monitoring signal

Claims (7)

[Claims] 1. A failed fan detecting device for detecting which one of a plurality of fan devices has failed, a failure detecting means for outputting a failure detection signal having a voltage corresponding to the fan device in a failed state. And a notifying unit for notifying a failed fan device among the plurality of fan devices based on the failure detection signal. 2. The failure detection means monitors failure states of the plurality of fan devices, and outputs a monitoring signal having a voltage corresponding to the failure state, based on the monitoring signal. 2. The fault fan detecting device according to claim 1, further comprising a fault signal generating means for generating a fault detection signal. 3. The fault according to claim 2, wherein said fault condition monitoring means includes voltage dividing means for generating a fault detection signal by dividing a voltage of a predetermined monitoring reference signal. Fan detection device. 4. The failure state monitoring means is provided on the fan device side, and the monitoring signal is transmitted to the failure signal generation means via one signal transmission line.
The failed fan detection device according to the above. 5. The device according to claim 1, wherein the failure detecting unit detects that one of the fan devices is in the failure state based on the failure detection signal, and then corresponds to a case where all the fan devices are in a normal operation state. 3. The failed fan detection device according to claim 2, further comprising a signal holding unit that holds the output of the failure detection signal until the monitoring signal is output. 6. When the monitoring signal corresponding to a case where all the fan devices are in a normal operation state is output,
6. The apparatus according to claim 5, further comprising reset means for resetting the signal holding means. 7. The signal holding means comprises a self-holding relay device.
The failed fan detection device according to the above.